Residential Gateway Device

On boot up this am Win ME showed that I had a new device available - a Residential Gateway Device was installed in my Network Neighborhood.
It's properties shows nothing - Invoking it does nothing (that I know of).
No visable way to delete it.
My Firewall shows access trying to get to: 239.255.255.250 but blocks it..
Questions:
What is it?
How is it gotten?
How do I get rid of it?